Any plugins that re-register jQuery, from the sounds of it, something is registering an older version of jQuery, which does not support have the live function.
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t31osAug 1 '11 at 10:34

Correct - the version showing is 1.2.6 in the thickbox.js but the actual version I am loading is 1.6.1
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JohnnyBizzleAug 1 '11 at 10:57

Is jQuery only loaded once, ie. if you check the source of the page is there only 1.6.1, or are you seeing any other versions output? Any possibility of seeing a page with the problem?
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t31osAug 1 '11 at 11:10